Varian UNITY INOVA NMR, Hardware Installation, Page: 51 / 65

Chapter 6. CRAMPS/Multipulse Module Tests
50
UNITY
INOVA Solids Hardware Installation 01-999044-00 C0501
7. Enter
ga
, record the spectra, and measure the residual splitting of the dioxane triplet.
Figure 21 shows a spectrum.
8. Use
h2cal
to calculate
γ
B
2
. No specification exists, but a value of about 25 kHz is
needed for the 100 W test to be successful.
9. Set HI BAND to HI POWER. Be sure that
dpwr=63
is calibrated for about 100 W
at the HI POWER output, or use the value of
dpwr
that gives about 100 W.
10. Enter
ga
, record the spectra, and measure the residual splitting of the dioxane triplet
with
dof=–7e4,7e4
.
CAUTION:
Avoid damaging the probe, follow all pulse duration, pulse power, and
duty cycle cautions and warnings when given for a particular probe.
Generally, pulse durations can be increased with a proportional
decrease in pulse power.
11. Use
h2cal
to calculate
γ
B
2
. Set
dpwr
to achieve a
γ
B
2
that is as close as possible
to the minimum values listed in the following table. Do not exceed this power level
for any other experiment. For the XPOLAR pulse sequence, the maximum
level1
and
level2
correspond to this
dpwr
value.
Magnet Varian RT CP/MAS Doty CP/MAS Varian VT CP/MAS
200 MHz 75 kHz — —
Figure 21. Decoupler Field Strength
γ
B
2
ACQUISITION SAMPLE PROCESSING FLAGS
sfrq 100.57 date Apr 1 lb 10.00 il n
tn C13 file exp sb not used toss n
at 0.100 DECOUPLING gf not used pdp n
np 6016 dn H1 awc not used dp y
sw 3000.0 dof arrayed lsfid not used SPECIAL
xpol n dm nny phfid not used srate 415
tpwr 55 dmm c wtfile temp not used
tpwrf 4095 dpwr 63 proc ft
pw 8.0 level1 45 fn 32768
p1 0 level1f 200 FLAGS
d1 30.000 level2 50 werr ai no ph
tof 0 level2f 4095 wexp
nt 1 dpwrf 4095 wbs
ct 1 wnt
Gamma-H2 calculation
See J. Magnetic Resonance 7:442 (1972)
jo = 284.00 Hz, dof[1] = –70000.00 Hz, dof[2] = 70000.00 Hz
jr[1] = 165.00 Hz, jr[2] = 167.00 Hz
Gamma-H2 = 69404.97 Hz
90 degree pulse = 3.6 usec
coalescence frequency = –457.51 Hz